21203031300 has 288 divisors, whose sum is σ = 69142907904. Its totient is φ = 4971456000.

The previous prime is 21203031299. The next prime is 21203031341. The reversal of 21203031300 is 313030212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21203031300.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 25762689 + ... + 25763511.

Almost surely, 2^21203031300 is an apocalyptic number.

21203031300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21203031300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34571453952).

21203031300 is an abundant number, since it is smaller than the sum of its proper divisors (47939876604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21203031300 is a wasteful number, since it uses less digits than its factorization.

21203031300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1099 (or 1092 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 15.

Adding to 21203031300 its reverse (313030212), we get a palindrome (21516061512).

The spelling of 21203031300 in words is "twenty-one billion, two hundred three million, thirty-one thousand, three hundred".